Trane 4TWR6 - User Manual

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18-AC104D1-1E-EN

ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES

IMPORTANT — This Document is customer property and is to remain with this unit. Please return to service informa-

tion pack upon completion of work.

Heat Pumps

These instructions do not cover all variations in systems or provide for every possible contingency to be met in connection with

the installation. Should further information be desired or should particular problems arise which are not covered sufficiently for the

purchaser’s purposes, the matter should be referred to your installing dealer or local distributor.

Note: The manufacturer recommends installing only approved matched indoor and outdoor systems. All of the manufacture’s split

systems are A.H.R.I. rated only with TXV/EEV indoor systems. Some of the benefits of installing approved matched indoor and

outdoor split systems are maximum efficiency, optimum performance and the best overall system reliability.

4TWR6

Installer’s Guide

Table of Contents

Section 1. Safety ..................................................................................... 2

Section 2. Unit Location Considerations ............................................. 3

Section 3. Unit Preparation .................................................................... 5

Section 4. Setting the Unit ..................................................................... 5

Section 5. Refrigerant Line Considerations ......................................... 6

Section 6. Refrigerant Line Routing ..................................................... 7

Section 7. Refrigerant Line Brazing ...................................................... 8

Section 8. Refrigerant Line Leak Check ............................................. 10

Section 9. Evacuation .......................................................................... 11

Section 10. Service Valves .................................................................. 11

Section 11. Electrical - Low Voltage ................................................... 13

Section 12. Electrical - High Voltage .................................................. 15

Section 13. Start Up .............................................................................. 16

Section 14. System Charge Adjustment ............................................. 17

Section 15. Checkout Procedures and Troubleshooting .................. 23

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Summary

Section 1. Safety

General Safety Warnings

General safety warnings for qualified personnel.

Electrical Safety Precautions

Warnings for working with live electrical components during service.

Refrigerant Handling Safety

Safety guidelines for R-410A refrigerant and POE oil.

Service Valve Operation Caution

Caution when opening the liquid line service valve.

Brazing and Soldering Caution

Ensure existing refrigerant lines are brazed, not soldered.

Compressor Safety

Warning about hot compressor dome temperatures.

Section 2. Unit Location Considerations

Unit Dimensions and Weight

Table detailing unit dimensions and estimated weights by model.

Refrigerant Piping Limits

Maximum refrigerant line length, vertical change, and connection sizes.

Location for Best Reliability

Clearance requirements for airflow and service access.

Cold Climate Installation

Precautions for snow accumulation and freezing temperatures.

Coastal Installation Considerations

Requirement for salt shields in coastal areas.

Section 3. Unit Preparation

Preparing the Unit for Installation

Steps to inspect and remove the unit from its packaging.

Section 4. Setting the Unit

Pad Installation Guidelines

Guidelines for installing the unit on a support pad.

Section 5. Refrigerant Line Considerations

Line and Valve Connection Sizes

Table detailing line and valve connection sizes by model.

Factory System Charge

Information on factory system charge and verification methods.

Required Refrigerant Line Length

Guidance on measuring line length and lift for charging.

Refrigerant Line Insulation

Importance of insulating the vapor line and avoiding direct contact.

Reuse of Existing Refrigerant Lines

Precautions when reusing existing refrigerant lines for retrofits.

Section 6. Refrigerant Line Routing

Routing Precautions and Isolation

Preventing noise transmission via vibration isolation for lines.

Line Set Securing and Isolation

Securing lines to joists/walls and avoiding ductwork contact.

Section 7. Refrigerant Line Brazing

Brazing Refrigerant Lines

Steps for preparing and brazing refrigerant lines.

Brazing Procedure Details

Purging, brazing, and filter drier installation steps.

Section 8. Refrigerant Line Leak Check

Leak Detection Procedure

Procedure for pressurizing and checking refrigerant lines for leaks.

Section 9. Evacuation

Evacuating Refrigerant Lines

Steps to evacuate the system using a micron gauge.

Section 10. Service Valves

Opening the Gas Service Valve

Procedure for opening the gas service valve.

Opening the Liquid Service Valve

Procedure for opening the liquid service valve with caution.

Section 11. Electrical - Low Voltage

Low Voltage Wire Length Limits

Table of maximum wire lengths for low voltage wiring.

Low Voltage Hook-up Diagrams

Wiring diagrams for thermostats and air handlers.

Defrost Control Operation

Information on defrost control settings and checkout.

Section 12. Electrical - High Voltage

High Voltage Power Supply Safety

Warnings and compliance for high voltage power supply.

High Voltage Disconnect Switch

Recommendation for installing a disconnect switch.

High Voltage Grounding

Requirements for grounding the outdoor unit.

Section 13. Start Up

System Start Up Procedure

Step-by-step procedure for starting the system.

Section 14. System Charge Adjustment

Temperature Measurement for Charging

Guide to measuring temperatures for charging.

Subcooling Charging in Cooling

Method for charging in cooling mode above 55°F.

Subcooling Correction Charts

Charts for calculating subcooling corrections based on line length and lift.

Using Subcooling Charging Tables

Using charging charts and tables to determine final subcooling.

Adjusting Refrigerant Level

Adjusting refrigerant level and verifying performance.

Weigh-In Method for Heating

Weigh-in method for charging in heating mode below 55°F.

Heating Mode Subcooling Check

Stabilizing system and checking subcooling in heating mode.

Section 15. Checkout Procedures and Troubleshooting

Operational and Checkout Procedures

Final inspection and operational checks before completion.

Troubleshooting System Faults

System faults and potential causes for refrigerant and electrical issues.

This document is an Installer's Guide for Trane 4TWR6 Heat Pumps, providing comprehensive instructions for installation, startup, and maintenance. It emphasizes compliance with national, state, and local codes throughout all phases of installation.

Function Description:

The Trane 4TWR6 Heat Pump is an outdoor condensing unit designed to provide heating and cooling for residential and commercial applications. It operates with R-410A refrigerant and is intended to be part of a matched indoor and outdoor system to ensure maximum efficiency, optimum performance, and overall system reliability. The guide stresses the importance of using AHRI-rated systems with TXV/EEV indoor systems for optimal results.

Important Technical Specifications:

Refrigerant: R-410A, which operates at 50-70% higher pressures than R-22.
Refrigerant Oil: POE oil, which readily absorbs moisture from the atmosphere.
Unit Dimensions and Weight:
- 4TWR6018H: 40 x 30 x 33 inches, 174 lbs
- 4TWR6024H: 33 x 30 x 33 inches, 174 lbs
- 4TWR6030H: 37 x 34 x 37 inches, 198 lbs
- 4TWR6036H: 37 x 34 x 37 inches, 199 lbs
- 4TWR6042H: 45 x 34 x 37 inches, 227 lbs
- 4TWR6048H: 45 x 34 x 37 inches, 250 lbs
- 4TWR6060H: 45 x 34 x 37 inches, 251 lbs
Refrigerant Piping Limits:
- Maximum horizontal line length: 60 feet.
- Maximum vertical change (lift): 60 feet.
- Service valve connection diameters vary by model (e.g., 3/4" vapor, 3/8" liquid for smaller units; 1-1/8" vapor, 3/8" liquid for larger units).
Low Voltage Wiring:
- 18 AWG: 150 Ft. Max.
- 16 AWG: 225 Ft. Max.
- 14 AWG: 300 Ft. Max.
Defrost Control: Selectable termination temperature (47°F as shipped, or 70°F by cutting Jumper J2).

Usage Features:

Installation Flexibility: The unit can be mounted on a pad or rooftop, with considerations for structural support and isolation to prevent sound/vibration transmission.
Location Guidelines: Specific recommendations for placement to ensure adequate airflow (minimum 12" from walls/shrubbery), unrestricted top discharge (minimum 5 feet), and service access (minimum 3 feet in front of control box). Avoid locations near bedrooms or windows where operational sounds or defrost vapor could be objectionable.
Cold Climate Considerations: For areas with snow accumulation, units should be elevated 3-12 inches above the pad/rooftop to allow for drainage of melted snow/ice and prevent obstruction of drain holes. Snow drift barriers are recommended if snow accumulation is likely.
Refrigerant Line Routing: Precautions are outlined to prevent noise transmission, including using isolation hangers when fastening lines to structural elements and insulating lines passing through walls/sills. Minimize 90-degree turns.
System Start-Up: A step-by-step process for initial system activation, including setting the thermostat to OFF, applying power, waiting one hour if a crankcase heater is used and ambient temperature is below 70°F, and finally setting the thermostat to ON.
Charge Adjustment: Detailed procedures for subcooling charging in cooling mode (above 55°F outdoor temp) and weigh-in charging in heating mode (below 55°F outdoor temp). Charts are provided for subcooling corrections based on line length and lift.
Troubleshooting: A comprehensive "System Faults" table helps diagnose issues related to refrigerant circuit, electrical components, and defrost function, categorizing causes as primary or secondary.

Maintenance Features:

Refrigerant Handling: Emphasizes the use of R-410A approved service equipment and proper handling of POE oil. Systems should remain sealed whenever possible, and driers must be changed when opening the system for component replacement.
Brazing Procedures: Detailed steps for brazing refrigerant lines, including deburring, cleaning, purging with dry nitrogen, and wrapping valve bodies with wet rags to prevent heat damage.
Leak Check: Instructions for pressurizing lines and the indoor coil to 150 PSIG with dry nitrogen and checking for leaks with a soapy solution.
Evacuation: A two-step process to evacuate refrigerant lines and the indoor coil to no higher than 350 microns, followed by observing the micron gauge to ensure it does not rise above 500 microns in one minute.
Service Valve Operation: Clear instructions for opening both gas and liquid service valves, including specific turn requirements and warnings for the liquid line service valve to prevent abrupt release of system charge.
Electrical Safety: Warnings regarding live electrical components and the necessity of following safety precautions. High voltage disconnect switches are required, and flexible electrical conduit is recommended to prevent vibration transmission.
System Stabilization: Before accurate charge measurements, the system must operate for a minimum of 20 minutes to stabilize after startup or any charge adjustments.
Checkout Procedures: A checklist for final inspection, including verifying leak-free refrigerant lines, proper insulation, secure and isolated lines, sealed masonry passages, tight electrical connections, clear outdoor fan operation, free-draining indoor coil, unobstructed registers/grilles, installed return air filter, correct airflow setting, and operation in all modes.